如果某方法在另一页面上运行,我试图刷新列表页面。我确实使用推送导航传递了上下文。
我试图遵循这三个答案Answer 1 Answer 2和Answer 3,但我无法在此处管理状态。
这是需要刷新的第一个列表页面。它调用一个类
class _PageLocalState extends State<PageLocal> {
@override
Widget build(BuildContext context) {
return Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: SafeArea(
child: ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: widget.allLocal.length,
//padding: const EdgeInsets.only(top: 10.0),
itemBuilder: (context, index) {
return LocalCard(widget.allLocal[index]);
},
)),
)
],
),
);
}
}
下一课:
class LocalCardState extends State<LocalCard> {
FavData localdet;
LocalCardState(this.localdet);
ListTile makeListTile() => ListTile(
contentPadding: EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),
title: Text(
localdet.name,
style: TextStyle(fontWeight: FontWeight.bold),
),
subtitle: Text(localdet.loc),
trailing: Icon(Icons.keyboard_arrow_right, size: 30.0),
onTap: () => navigateToDetail(localdet),
);
Widget get localCard {
return new Card(
elevation: 4.0,
margin: new EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
child: Container(
child: makeListTile(),
));
}
@override
Widget build(BuildContext context) {
return new Container(
child: localCard,
);
}
navigateToDetail(FavData localdet) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => FavouriteDetailPage(
mndet: localdet,
)));
setState(() {});
}
}
现在这将路由到最终的详细信息页面:
class _FavouriteDetailPageState extends State<FavouriteDetailPage> {
bool isFav = false;
FavData mndet;
_FavouriteDetailPageState(this.mndet);
// reference to our single class that manages the database
final dbHelper = DatabaseHelper.instance;
@override
Widget build(BuildContext context) {
Widget heading = new Container(...);
Widget middleSection = new Expanded(...);
Widget bottomBanner = new Container(...);
Widget body = new Column(...);
final makeBottom = Container(
height: 55.0,
child: BottomAppBar(
color: Color.fromRGBO(36, 36, 36, 1.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new FavIconWidget(mndet),
],
),
),
);
return Scaffold(
appBar: AppBar(
centerTitle: true,
title: Text('The Details'),
backgroundColor: Color.fromRGBO(36, 36, 36, 1.0),
),
body: Container(
child: Card(
elevation: 5.0,
shape: RoundedRectangleBorder(
side: BorderSide(color: Colors.white70, width: 1),
borderRadius: BorderRadius.circular(10),
),
margin: EdgeInsets.all(20.0),
child: Padding(
padding: new EdgeInsets.symmetric(vertical: 16.0, horizontal: 16.0),
child: body,
),
),
),
bottomNavigationBar: makeBottom,
);
}
void share(BuildContext context, FavData mndet) {
final RenderBox box = context.findRenderObject();
final String shareText = "${mndet.name} - ${mndet.desc}";
Share.share(shareText,
subject: mndet.loc,
sharePositionOrigin: box.localToGlobal(Offset.zero) & box.size);
}
}
class FavIconWidget extends StatefulWidget {
final FavData mnforIcon;
FavIconWidget(this.mnforIcon);
@override
_FavIconWidgetState createState() => _FavIconWidgetState();
}
class _FavIconWidgetState extends State<FavIconWidget> {
final dbHelper = DatabaseHelper.instance;
Future<bool> get isFav async {
final rowsPresent = await dbHelper.queryForFav(widget.mnforIcon.id);
if (rowsPresent > 0) {
print('Card Loaded - Its Favourite already');
return false;
} else {
print('Card Loaded - It is not favourite yet');
return true;
}
}
void _insert() async {...}
void _delete() async {...}
@override
Widget build(BuildContext context) {
return FutureBuilder<bool>(
future: isFav,
initialData:
false, // you can define an initial value while the db returns the real value
builder: (context, snapshot) {
if (snapshot.hasError)
return const Icon(Icons.error,
color: Colors.red); //just in case the db return an error
if (snapshot.hasData)
return IconButton(
icon: snapshot.data
? const Icon(Icons.favorite_border, color: Colors.white)
: Icon(Icons.favorite, color: Colors.red),
onPressed: () => setState(() {
if (!snapshot.data) {
print('Its favourite so deleting it.');
_delete();
} else {
print('Wasnt fav in the first place so inserting.');
_insert();
}
}));
return CircularProgressIndicator(); //if there is no initial value and the future is not yet complete
});
}
}
我确信这只是我所做的一些愚蠢的编码,只是无法发现。哪里。我尝试添加Navigator.pop(context);在详细信息页面的不同部分中,它将失败。
当前,我必须先导航回到“收藏夹”列表页面,然后导航到“首页”,然后再导航回到“收藏夹”列表页面以刷新列表。
尝试一下。在任何使用Navigator.pop或Navigator.push的地方。代替此,请使用此:
Navigator.pushReplacement(context,
MaterialPageRoute(builder: (BuildContext context) => Password())
);
//instead of Password use the name of the page(the second page you want to go to)